When under certain conditions, the P50 value of haemoglobin rises, the affinity of the pigment of combining with O2 will
1. Remain same
2. Rise
3. Fall
4. First rise and then fall
Hemoglobin that is bonded to carbon monoxide and therefore cannot transport oxygen, is called
1. carboxyhemoglobin
2. methemoglobin
3. reduced hemoglobin
4. carbaminohemoglobin
Which of the following does not shift the oxy-haemoglobin dissociation curve to the right?
1. increased pH
2. increased carbon dioxide
3. increased temperature
4. increased 2,3 -DPG
The partial pressure of oxygen is equal in
1. Atmospheric air and Alveoli
2. Alveoli and Oxygenated blood
3. Alveoli and Deoxygenated blood
4. Deoxygenated blood and Tissues
The solubility of carbon dioxide is about _____ times higher than that of oxygen across the respiratory membrane.
1. 20-25
2. 25-50
3. 125-150
4. 200-250
What amount of carbon dioxide is delivered by every 100 ml of deoxygenated blood to the alveoli?
1. 4 ml
2. 5 ml
3. 15 ml
4. 20 ml
Oxygen is mainly transported as oxyhaemoglobin in the blood. Identify the correct statement regarding oxygen transport in blood:
1. During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2
2. During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently.
3. Increased BPG levels in the red blood cells enhance oxygen-carrying capacity.
4. A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal.
The following statements refer to gas carriage by blood. Choose the correct statement:
| 1. | After leaving the lungs, each litre of blood contains about 20 ml of oxygen. |
| 2. | Haemoglobin is half saturated with oxygen when the PO2 is about 30 mm Hg |
| 3. | As the PCO2 rises, the affinity of haemoglobin for oxygen is increased. |
| 4. | Each litre of arterial blood contains about 50 mL of carbon dioxide. |
Reduction in pH of blood will
(1) reduce the blood supply to the brain
(2) decrease the affinity of hemoglobin with oxygen
(3) release bicarbonate ions by the liver
(4) reduce the rate of heart beat
People who have migrated from the planes to an area adjoining Rohtang Pass about six
months back
1. have more RBCs and their haemoglobin has a lower binding affinity to O2
2. are not physically fit to play games like football
3. suffer from altitude sickness with symptoms like nausea, fatigue, etc.
4. have the usual RBC count but their haemoglobin has very high binding affinuty to O2
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